Propeller for boats



(No Model.)

W. M. SPANN. PROPELLBR FOR BOATS.

No. 568,499. Patented Sept. 29, 1896.

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UNITED STATES PATENT OFFICE.

\VILLIAM M. SPANN, OF DONIPHAN, MISSOURI.

PROPELLER FOR BOATS.

SPECIFICATION forming part of Letters Patent No. 568,499, datedSeptember 29, 1896. Application filed May 21, 1896- Serial No. 592,494.(No model.)

To all whom it may concern:

Be it known that I, WILLIAM M. SPANN, a citizen of the United States,residing at Doniphan, in the county of Ripley and State of Missouri,have invented certain new and useful Improvements in Propellers forBoats; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, which form a part of this specification.

This invention relates to certain new and useful improvements inpropellers for boats of that class in which the paddle bar is mounted tomove vertically through the water, so that the lifting of the water isavoided.

The paddle is mounted so that it enters the water endwise and comes outthe same way. Lifting of the dead-water is avoided and hence increasedpower is attained by less exertion of the person in the boat. Anydesired number of paddles may be employed.

The invention has for its object to provide an improved construction ofthis kind which shall be simple, cheap, durable, and efficient and soconstructed that the paddles may be easily adjusted to any depth ofwater.

Other objects and advantages of the invention will hereinafter appearand the novel features thereof will be specifically defined by theappended claim.

The invention in this instance resides in the peculiar combinations andthe construction, arrangement, and adaptation of parts, all as morefullyhereinafter described, shown in the drawings, and then particularlypointed out in the claim.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisspecification, and in which- 1 Figure 1 is a perspective view showingthe application of my invention. Fig. 2 is a vertical longitudinalsection through the same through one of the paddles. Fig. 3 is a detailshowing the manner of adjusting the stirrups.

Referring now to the details of the draw ingsby letter, A designates aportion of a boat of any sort to which the paddles may be applied eitherat the stern or side. In this instance they are shown as applied at thestern. projecting supports B are disposed substantially parallel witheach other, and in the spaces between these supports the paddles aremounted to work.

0 are the paddles, of any desired material and size and shape. There.may be more or less of them, and they are mounted upon the crank-shaftsD and E, whichare disposed in parallel relation with each other, as seenin both of the views. The crank-shafts are mounted in the outer ends ofthe vertical supports B, and the paddles are secured to the cranks bymeans of the stirrups or the like F, which are adjustable thereon, asseen in Fig. 3, so that the paddles may be raised or lowered accordingto the depth of the water.

The bearings of the crank-shafts in the vertical supports are preferablypartially in the ends of the supports and partially in the plates G,secured to the ends of the said supports, as seen best in Fig. 1. Thecrankshafts are placed in position and then the plates are applied andscrews or screw threaded rods or other means employed for holding themin place. The paddles have their upper and lower ends beveled, as seenin Fig. 2, to facilitate their entering the water and moving out of thesame.

The employment of the double crank-shafts is deemed important, as itinsures movement of the paddles in a predetermined path and dispenseswith the necessity of guides for the upper ends of the paddles and alsoavoids the necessity of the extension of the paddles to pass through andbe guided bysuch guides.

Motion may be imparted to the crank-shaft, either the upper or lowerone, in any desired manner, either by hand or through the me-.

dium of an endless chain or a pitman and connections, but as the meansfor operating the paddles forms no part of the present invention thesame have not been shown.

WVhat is claimed as new is The combination with a boat and thevertically-disposed supports at the rear thereof, of the removableplates on the rear ends of In this arrangement the rearwardly-- 10 thecranks of both shafts, and having their ends beveled and adapted toenter and leave the Water substantially vertically, substantially asherein shown and described.

In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM M. SPANN.

\Vitnesses:

BENNETT PAUL, J. B. PAUL.

